Author	Contenent	Country	Date	Period	Genus
Austin	NA	USA - OH	1927	Ordovician	Zygospira
Billings	NA	CanadaQuebec	1866	Silurian	Zygospira
Bretsky	NA	USA - NY	1977	Ordovician	Zygospira
Chen	Asia	China	1987	Ordovician	Zygospira
Chronic	NA	USA - WY	1931	Ordovician	Zygospira
Decker	NA	USA - OK	1931	Ordovician	Zygospira
Fenton	NA	USA - MO	1928	Ordovician	Zygospira
Foerste	NA	USA - MI	1917	Ordovician	Zygospira
Hall	NA	USA - IN	1882	Silurian	Zygospira
Howe	NA	USA - TN	1988	Ordovician	Zygospira
Howe	NA	USA - TX	1965	Ordovician	Zygospira
Hurst	Europe	England	1979	Ordovician	Zygospira
Marek	Europe	Czechoslovakia	1967	Ordovician	Zygospira
Misius	Asia	Kirghizia	1986	Ordovician	Zygospira
Nettelroth	NA	USA - KY	1889	Silurian	Zygospira
Ockerman	NA	USA - WI	1926	Ordovician	Zygospira
Percival	Asia	Australia	1990	Ordovician	Zygospira
Raymond	NA	USA - VT	1911	Ordovician	Zygospira
Reed	Europe	Norway	1932	Ordovician	Zygospira
Reed	Europe	Scotland	1935	Ordovician	Zygospira
Reed	Europe	Wales	1905	Ordovician	Zygospira
Rice	NA	USA - MN	1985	Ordovician	Zygospira
Ross	NA	USA - ID	1957	Ordovician	Zygospira
Ross	NA	USA - MT	1957	Ordovician	Zygospira
Rubel	Europe	Baltic	1970	Silurian	Zygospira
Sardeson	NA	USA - MN	1901	Silurian	Zygospira
Shrock	NA	USA - IN	1937	Ordovician	Zygospira
Shrock	NA	CanadaNewfoundland	1939	Silurian	Zygospira
Ulrich	NA	USA - OH	1879	Silurian	Zygospira
Wang	NA	USA - IA	1949	Ordovician	Zygospira